Higher-Dimensional Algebra VII: Groupoidification (2009)
Baez, John C., Hoffnung, Alexander E., Walker, Christopher D.
Groupoidification is a form of categorification in which vector spaces are replaced by groupoids, and linear operators are replaced by spans of groupoids. We introduce this idea with a detailed...
Groupoidification Made Easy (2008)
Baez, John C., Hoffnung, Alexander E., Walker, Christopher D.
Groupoidification is a form of categorification in which vector spaces are replaced by groupoids, and linear operators are replaced by spans of groupoids. We introduce this idea with a detailed...
Renormalization Made Easy (1999)
John C. Baez, Er E. Hoffnung, Christopher D. Walker
Groupoidification is a form of categorification in which vector spaces are replaced by groupoids, and linear operators are replaced by spans of groupoids. We introduce this idea with a detailed...